WHAT: Selection of the host city for the 2016 Summer Olympics.
WHEN: Friday, Oct. 2.
THE CANDIDATES: Chicago, Madrid, Rio de Janeiro and Tokyo.
WHO DECIDES: The International Olympic Committee.
VOTING PROCESS: IOC members vote by secret ballot until one city receives a majority; the city receiving the fewest votes is eliminated after each round. The maximum number of rounds is three.
HOW MANY: The IOC has 106 members. The president, Jacques Rogge, doesn't vote. Members from a country with a bid city in the race are ineligible to vote as long as their candidate is still in contention. That means 98 members are eligible to vote in the first round; more in subsequent rounds. In the event of a tie vote in the early rounds, a runoff is held between the two cities. If there is a tie in the final round, Rogge can vote or ask the IOC executive board to break the deadlock.
THE VENUE: The Bella Conference Center.
PRESENTATIONS: Each city will make 45-minute presentations to the IOC members on the day of the vote, with another 15 minutes for questions and answers.
THE ORDER: The presentations begin with Chicago at 8:50 a.m. Copenhagen time. Tokyo goes next at 10:30 a.m., followed by Rio at 12:10 p.m. and Madrid at 2:50 p.m.
THE VOTE: Members start voting at 5:10 p.m. (1510 GMT) Voting finished by 5:40 p.m. (1540 GMT)
THE ANNOUNCEMENT: The announcement ceremony is scheduled from 6:30 to 7 p.m. (1630 to 1700 GMT)